| 摘要 |
PROBLEM TO BE SOLVED: To obtain optimal coating conditions easily by moving a die forward and backward with a film and further, moving the die in parallel with a direction in which the film proceeds for coating to control the thickness distribution of a coat. SOLUTION: When coating a film by a free span process, upstream and downstream gaps t1, t2 are set to be t1>t2, so that a liquid pressure is generated to keep the film afloat and the film is coated. When an upstream span and a downstream span are equal, however, almost no liquid pressure is generated, so that a microgap is actually kept as it is and consequently, a coating liquid drips from the tip of a die lip. On the other hand, when the film is coated to establish that it is the upstream span > the downstream span by sliding the die into the X direction of a coordinate axis under the described conditions, the relationship between the elevationθ1,θ2 of the film and the component of force T1, T2 isθ1<θ2 and T1<T2 respectively. Consequently, the upstream gap and the downstream gap t1, t2 are t1>t2 so that a liquid pressure for keeping the film afloat is generated and the film is coated.
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